Oil switch and controlling mechanism



Dec. 13,1927.

C. AALBORG OIL SWITCH AND CONTROLLING MECHANISM Filed Sept. 2, 1922 4Sheets-Sheet 1 Fig.1.

Contact Member: Closed WITNESSES: Wfi J- OIL SWITCH AND CONTROLLINGMECHANISM Filed Sept. 2, 1922 4 Sheets-Sheet 2 Jr {0 4L\\ lNVENTORChrisiz'an Aalborg.

1,652,508 c. AALBORG V OIL SWITCH AND CONTROLLING MECHANISM Filed Sept.2, 1922 4 Sheets-Sheet 3 Canhuf Mrmtef: Open E WITNESSES: INVENTOR v w I40 Chrislian Aalbozzg.

. rr"r1 BY Dec. 13,1927. 7

C. AALBORG OIL SWITCH AND CONTROLLING MECHANISM Filed Sept. 2, 1922 4Sheets-Sheet 4 Closed Posilion INVENTOR Chrislian Aalbo WITNESSES:

I BY ATTORNEY Patented Dec. 13, 1927.

'. cnnls'rmn IAALBORG, or" ITTSBURGH,"rENns vAivIA, ASSIGNOB TO,wnsrmqnonsn ELEcTnI'o & MANUFACTURING COMPANY, A CORPORATION orrnmvsrnon. swncnnivn 'ooivrRonLIne MECHANISM;

j Application filedseptember 2, 1922. Serial No." 585,879.

My invention relates to circuitinterrup-I ters having relatively:movable contact mem-k bers immersed in a fluid," and more par-.

- ticularly to the mechanism forgoperating the contact members. 1

One object of my invention is 'to provide an operating mechanism forlargecapacity circuit ,interrupters which is designed to se-:

curely hold .the contact members during the severe.fblowout forcesincident to the nterruption. of electrical c'urrentsof great magnitude.t

' 'Anotherobject of my inventlon is to provide an operating mechanismforjcircuit interrupters which shall be quick andfpositive in itsoperation.. A iurther object of my 1T1Vent1011-. 1S to N provideanoperating mechanism for circuit 'interrupters which shall be simple incon;

struction and consist of .few parts.

I have 'foundthatf'the blowout forces,

both electrical and chemical,incidental. to the'interruption of anelectricalclrcuit car rying a large. currentaatahigh voltage, to

be so severe as to require greaterstrengthening and .bracingof the.supporting rods carrymg the movable contact member than is found in" themechanisms heretofore eon-' structed. 9

In accordance withmy invention, a guide member is rigidly secured to aninner wall of the receptacle enclosing the'circui-t-inten ruptingmechanism. A pair- 0f movable supporting. rods are arranged' tomovepar.- allel with, and adjacent to, said guidememhers, thereby receivingadditional support.

" The movable contact; member is securedto A plurality of curedto themovable contact :member at both supporting I members, k thereby givingthe contact member greater resistance toy bending; moments and securinga simultaneousbreak from-bothlof thefixed contact members.

supporting rods, are sespaced points. Thesupportingrods-are sus- :pendedfrom. a common ,member' which is. pivotally supported by atra'in of linkmechanism... The supporting rods are secured to a guide post in suchamannerthat they are .braceda short distance from their connec tiontothe movable contact member.

Because of the comparatively shortfunv the contact members are bracesaid rods.

supported portions of the supporting rods and because of the existenceof a plurality of fixed bearing points on the moving contact member,twisting and bending of these parts interrupter showing the position ofthecontrolling mechanism when the contact members are in a' closedposition. v Fig. 2 is a similar view'illustrating the position of thecontrolling mechanism when thecontact members'areinfasemi-open'posit1on. 1.

Fig. 3- is a similar-view illustrating the positionof the controllingmechanism when p in their open position. r

LFig. 4.15 a view,'partially in section and I partially inelevation,'o'f a circuitinterrupter equ pped With my invention.

-Fig. 5,is a side view of the link mechanism taken along the line IV-'IVof-Fig. '3.

. In the several. figures of the drawing, similar referencenumeralsrefer to like parts.

In Fig. 415' shown a circuit interrupter 1, of any desired form,comprising a tank portion '2. and a cap portion 3. In practice, the

Secured to the cap 3 are a pair ofiin'sulai anism,to behereinafter"described. In case a polyphase circuit mterrupter bedesired, a

correspondingnumber of insulators 4; may be provided.

. In the tank '2, a pairof fixed contact. mem- I bers 6 constitute theterminals for the conductors enteringlthe' interrupterthrough theinsulators A movable contact member 7, I

having. contacts Slmounted thereon in registry with contacts6,,issupportedby 1 ralityof supporting 'rods 9, of any suitablematerial, as, for example, insulated iron piping, wood or micarta.

A guide member ll, ofanysuitable material,' is mounted on. the capmember-*3. by i straps .14 and clamp 15. A brace-"16' (Fig.

spaced relation to guide 11, .as' well as to meansof a bracket 12,clamping bolts-13 9 i Secured to the cap 3 are a series of alinedconduits 17, 18 housing a control rod 19. In the arrangement hereillustrated, rod 19 extends to a plurality of circuit interrupters forsimultaneous operation thereof. It is obvious that the length of the rod19 may be changed for any other desired number of interrupters.

A suitable fitting 21 is attached to rod 19. A rocker arm 22 is pivoted,as at 23, to the fitting 21. (hie end of arm 22 is pivotechas at 21, tothe bracket 12 and straps 14. The opposite end of arm 22 is provldedwith a. head 24 for contact with a spring 25 that mounted, by means of abracket 26, upon cap 3.

A link 27 is pivoted to the arm 22, as at 28, adjacent to the head 24;.

Pivoted between straps 14, as at 29, is a slotted. bracing link31pivotally secured to link 27, as at 32. A bracket 33 is rigidlysecured to bracket 26. Pivoted, asat 8 1, to bracket 33, are a pair oflinks 35 which are, in turn, pivoted, as at36, to aqheavy bifurcatedmember 37.

As shown in Fig. 5, member 37, is a specially braced link ofH-shape, theends of which terminate in bifurcations 38, 39. Ends 39 are furtherbifurcated to form ears forpivots 36, and ends 39 are furtherbifurcatedfor attachment of the supporting rods 9 by fitting 40.Substantially midway of its length, member 37 is attached to link 31 bythe pivot 41. i i

The operation of the link mechanism is best understood by following themovement of each part from the closed positions of the contact members6, 7 and 8, asshown in Fig. 1, to their open positions, as shown in Fig.3, Fig. 2 illustrating their. intermediate positions.

To open the contact members rod 19is actuated, in any desired manner,toward the right, (Fig. 1) with a corresponding movement of the pivotpoint 23. After a very short movement of rod 19, rocker arm 22 passesthe dead-center line between pivots 23 and 2 1, after which the movementof the parts is acceleratedby the force of gravity and by the arcblowoutl forces.

,Movement of arm 22 causes link 27 to bear upon link 31, andthe latter,turningabout point 29, draws upon link member 37. The latter has apivotal movement about point 36, as well as a translatory motion causedby the turning of links 35 about point 34. The result is to effect asubstantially rectilinear movement of the upper end of the link 37 andthe rod 9 connected thereto.

The rods 9 are guided by the members 11 and 16 so that an even break ismade between or twisting of member 7.

The downward movementof the parts is terminated when head 24 strikesspring 25,

the latter acting as a shock absorber for the entire system.

To close thecontact members,rod 19 is. 3

moved to the left, Fig. 3, which, in turn, causes the parts to assumethe position .shown in Fig.1.

It will thus be seenthatI have devised a quick posltlve-actmg controlmechanism which is mgged in construction and yet the spirit and scopethcrcoflas set forth in the appended claims.

I claim as my invention: 1 i 1. In acircuit interrupter, a pair of fixedcontact members, amovable contact member adapted to bridge said fixedcontactmem here, a plurality of spaced supporting memhers secureddirectly to said movable contact i so member and disposed in alongitudinal plane thereof, andaseries of links for controlling saidsupporting members.

2. In a circuit interrupter, a pair of fixed contactanembers, afixedguidemcmber extending between saidfixed contact members,

a movable contact member bridging said fixed contact members, a airofsupporting members attached to sai member at: such a distance fromtheguide movable contact member as to prevent twisting of the'bridgingmember, said guide member being disposed between said supporting membersand in a longitudinal planethereof, and a linkgvork for controlling saidsupporting memers. r 3. In a circuit interrupter, a movable contactmember, a pair of spaced supporting rods secured directly to saidcontact memher, a bifurcated floating member for connecting saidsupporting rods in spaced relation, and mechanism foractuating the bi- Nfurcated member.

4. In a circuit interrupter, an actuating means, a link controlledbysaid actuating means, one end of said link being pivotally connected tothe circuit-breaker frame, a second link secured to the free end of thefirst named link, a third linkpivoted to the circuit-breaker frame andcontrolled by the second named link, a bracket member secured to thecircuit-breaker frame, afourth link secured to an end of saidbrackctmemher, a bifurcated member supported by the fourth-named link,said bifurcated member being actuated by movement ofthe thirdnamed link,a movable contact member,an'd supporting rods for sand movable contacter. i

member, a movable contact member, splurality of supportlng rodsassociated with member supported by said bifureatedmemboth setsofcontacts 6, 8, without bending b 5. In a circuit interrupter, afixedguide I tion with a pair of fixed contact members,

sides thereof in a longitudinal plane of the contact member ,for movingsaid contact member and link mechanism for actuating said supportingrods.

"6t In a circuit interrupter,the combinaand a movable contactmemberspanning [said fixed contact members, of a plurality of supporting.members secured at spaced intervals to said movable contact member in 'alongitudinal plane thereof whereby suspended therefromand connected tothe bending and twisting of-the latter is prevented. o I

7.- In a circuit interrupter mechanism, a contact bridging member, apivoted member, a plurality of contact-supporting members,

' bridging member in a longitudinal plane thereof, and meansforactuating said pivoted memben. V

8.- In a circuit breaker, a bridging memnec ted thereto in spacedrelation and in a longitudinal plane thereof, a floating lever; 'foractuating the: rods, pivotally supported at one end by a'pair ofrelatively Widelyspaced supporting members having their pivot shaftdisposed parallel to the plane of the rods and pivotally engaging thesaid rods at relatively Widely separated points, to constitute a pivotallinkage capable of resisting side stresses Without appreciabledeflection. a a s In testimony whereof, I have hereunto subscribed myname this 31st day of August, 192a r CHRISTIAN AALBORG.

ber, a pair of-supporting rods directly con:

